Table of ContentsSouthern suburbs Single Storey Extension Cost Per M2 Greater SydneySutherland Shire Cost Of 20 Square Metre Extension Canterbury-Bankstown Extension Costs Per Square Metre As a general rule, an 80 square metre ground floor house extension costs $160,000 – $320,000, or approximately $2000/m2 to $4000/m2. The distinction is in the kind of building and […]